Article
Chemistry, Physical
Chun-Jen Shih, Ya-Ze Li, Meng-Zhen Li, Sajal Biring, Bo-Chi Huang, Che-Wei Liu, Tzu-Hung Yeh, Dian Luo, Jiun-Haw Lee, Yi-Hsuan Huang, Ken-Tsung Wong, Shun-Wei Liu
Summary: This study presents an organic upconversion device that efficiently converts infrared light to visible light using a low operating voltage and demonstrates linear dynamic luminance response to infrared power density as well as real-time response to frequency-modulated signals. This device also features transparent multilayered electrodes for high-resolution infrared visual images.
Article
Chemistry, Multidisciplinary
Ning Li, Naresh Eedugurala, Dong-Seok Leem, Jason D. Azoulay, Tse Nga Ng
Summary: This article introduces an organic upconversion imager that efficiently performs optical and electronic readouts, with high optical upconversion efficiency and electronic detectivity, capable of extending human and machine vision to 1400 nm. The imager is suitable for various applications such as object inspection, imaging through smog, and recording blood vessel location and blood flow pulses.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Wei-Hsu Hu, Camilla Vael, Matthias Diethelm, Karen Strassel, Surendra B. Anantharaman, Abdessalem Aribia, Marco Cremona, Sandra Jenatsch, Frank Nuesch, Roland Hany
Summary: This study reports high image-contrast, narrowband organic upconversion devices that convert near-infrared light into visible light. The response speed is primarily determined by the electron mobility in the OLED, where the low electron drift velocity sets a fundamental limit to the response speed of OUCs.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Karen Strassel, Wei-Hsu Hu, Sonja Osbild, Daniele Padula, Daniel Rentsch, Sergii Yakunin, Yevhen Shynkarenko, Maksym Kovalenko, Frank Nuesch, Roland Hany, Michael Bauer
Summary: The use of SWIR optical sensing and imaging is crucial for next-generation applications, with all-organic SWIR upconversion devices showing promise as a low-cost alternative to current technologies. Limited organic materials are suitable for OUC applications, highlighting the need for further research and development in this area.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Chun-Jen Shih, Chao-Yang Lin, Kai Chen, Nurul Ridho Al Amin, Dian Luo, I-Sheng Hsu, Abdul Khalik Akbar, Sajal Biring, Chih-Hsuan Lu, Bo-Han Chen, Shang-Da Yang, Jiun-Haw Lee, Shun-Wei Liu
Summary: The research establishes infrared visualization technologies using large-area, semi-transparent organic upconversion devices, which can display high-resolution invisible images without photolithography. By exploiting all photoinduced charge carriers and optimizing the device structure, efficient infrared photon utilization is achieved.
Article
Materials Science, Multidisciplinary
Yaxiong Wei, Kebin An, Xinsheng Xu, Zeyuan Ye, Xiaojun Yin, Xiaosong Cao, Chuluo Yang
Summary: The research introduces an innovative organic photosensitizer for achieving high-efficiency near-infrared to blue triplet-triplet annihilation upconversion. This system shows considerable upconversion quantum yields, a large anti-Stokes shift, and exceptional photostability, presenting potential applications in photovoltaics, photocatalysis, bioimaging, and other fields.
ADVANCED OPTICAL MATERIALS
(2023)
Review
Materials Science, Multidisciplinary
Tianyu Rao, Menglu Chen, Ge Mu, Xin Tang
Summary: This paper summarizes the recent advances and progress of infrared-to-visible upconversion devices, and presents the main limitations of upconversion technology and the challenges that need to be addressed for the future development of infrared upconverters.
Article
Optics
Tobias Pfeiffer, Jens Klier, Georg von Freymann, Daniel Molter
Summary: Nonlinear frequency conversion provides an elegant method for detecting low-energy photons with different wavelengths from the pump wavelength while providing phase information. We propose a phase-sensitive measurement method in the terahertz spectral range using visible light, which enables fast determination of layer thicknesses and achieves phase-resolved detection of terahertz pulses with standard equipment.
Article
Chemistry, Multidisciplinary
Keunsoo Jeong, Dojin Kim, Hyun Jun Kim, Yong-Deok Lee, Jounghyun Yoo, Dohyub Jang, Seokyung Lee, Hyeonjong Park, Youngsun Kim, Ajay Singh, Dong June Ahn, Dong Ha Kim, Joona Bang, Jungahn Kim, Paras N. Prasad, Sehoon Kim
Summary: Hybrid nanostructures show promise for ultrasound-triggered drug delivery and treatment, known as sonotheranostics. While structures using plasmonic nanoparticles for photothermal-induced microbubble inflation for ultrasound imaging are limited in therapeutic applications due to short microbubble lifetimes and limited contrast, a photochemistry-based alternative has been developed. The introduced photoechogenic inflatable hierarchical nanostructure approach allows for dual-modal imaging and drug delivery deep inside tumors through a combination of upconversion luminescence and ultrasound stimulation.
Review
Engineering, Biomedical
Yinyan Lin, Yuanfa Yao, Wanmei Zhang, Qiuyu Fang, Luhao Zhang, Yan Zhang, Yingke Xu
Summary: Upconversion-mediated optogenetics utilizes lanthanide upconversion nanoparticles (UCNPs) to indirectly activate traditional optogenetic proteins with near-infrared light, allowing for high spatiotemporal resolution and minimal invasiveness in controlling cell activities in deep tissues and living animals.
ACTA BIOMATERIALIA
(2021)
Article
Chemistry, Multidisciplinary
Xiaoyang Du, Jiayue Han, Zeyu He, Chao Han, Xiaomu Wang, Jun Wang, Yadong Jiang, Silu Tao
Summary: An efficient organic UCD with a low V-on and high efficiency is introduced, capable of detecting weak NIR light and providing highly resolved imaging for biological applications.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Wenli Lv, Juanjuan Zhou, Zhengkang Zhou, Xuan Li, Qinyong Dai, Sunan Xu, Junkang Zhong, Yuanlong Liang, Lei Sun, Feiping Lu, Yingquan Peng
Summary: This paper investigates NIR OUDs by integrating PbPc:C60 BHJ as sensitizer with both normal OLED and inverted OLED as emitter, and explores the impact of carrier blocking layers on device performance. Particularly, OUDs with CuPc EBL exhibit the best performance, indicating that introducing an electron blocking layer with high hole mobility can effectively improve device performance.
Article
Chemistry, Multidisciplinary
Felix Glaser, Christoph Kerzig, Oliver S. Wenger
Summary: SenI-ET is a photoredox strategy that relies on two consecutive light absorption events, and can operate via sensitized triplet-triplet annihilation upconversion. It is a useful tool in synthetic photochemistry, and can be applied to various photocatalytic reactions.
Article
Chemistry, Analytical
Francesco Radica, Giancarlo Della Ventura, Luca Malfatti, Mariangela Cestelli Guidi, Annalisa D'Arco, Antonio Grilli, Augusto Marcelli, Plinio Innocenzi
Summary: Exposure to styrene is a major concern in the fibreglass processing industry due to its carcinogenic properties. An improved and portable method based on FTIR spectroscopy has been introduced for analyzing toxic gaseous substances in working sites down to a concentration below 4 ppm, providing accurate quantitative information even when various VOCs are present in a mixture.
Article
Green & Sustainable Science & Technology
Anees A. Ansari, Mika Sillanpaa
Summary: The integration of upconversion nanoparticles (UCNPs) with semiconductors for NIR-driven photocatalytic systems is explored, focusing on synthesis methods and improving emission efficiency. Efforts to enhance light absorption capability through hetero-nanostructures and the development of efficient UCNPs-based NIR-light-responsive photocatalysts are crucial. Research also discusses the importance of developing heterostructures between UCNPs and low-energy bandgap materials for improved absorption under UV/visible/NIR sunlight.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Review
Chemistry, Multidisciplinary
Lei Lei, Qi Dong, Kenan Gundogdu, Franky So
Summary: Metal halide perovskites are gaining attention in optoelectronic applications due to their properties such as large absorption coefficient, low defect density, and high charge carrier mobility. While progress has been made in perovskite-based lasers, the development is still in its early stages and electrically pumped lasers have not been realized yet. Understanding the fundamental photophysical characteristics of perovskite gain materials is crucial to accelerating their development in laser applications.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Xiangyu Fu, Yash Mehta, Yi-An Chen, Lei Lei, Liping Zhu, Nilesh Barange, Qi Dong, Shichen Yin, Juliana Mendes, Siliang He, Renuka Gogusetti, Chih-Hao Chang, Franky So
Summary: The study demonstrates highly directional and polarized light emission from LEDs by selectively diffracting the TE waveguide mode, showing potential for more efficient photonic applications.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Michael Worku, Azza Ben-Akacha, Samanvitha Sridhar, Jordan R. Frick, Shichen Yin, Qingquan He, Alex J. Robb, Maya Chaaban, He Liu, J. S. Raaj Vellore Winfred, Kenneth Hanson, Franky So, Daniel Dougherty, Biwu Ma
Summary: This study reports the band edge control of perovskite emitting layers for blue PeLEDs using organic spacer cations with different dipole moments to enhance charge balance and device performance. Blue PeLEDs based on MePEA quasi-2D perovskites show twofold increase of the EQE compared to the control PEA based devices, demonstrating the effectiveness of dipole moment modification in improving performance.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Physics, Applied
Xiangyu Fu, Shichen Yin, Yi-An Chen, Liping Zhu, Qi Dong, Chih-Hao Chang, Franky So
Summary: Since the invention of organic light emitting diodes (OLEDs), research has been focused on improving efficiency and lifespan, particularly in the development of high-brightness tandem OLED structures. While high-brightness tandem OLEDs have been successfully used in displays and lighting, a major challenge lies in the low light extraction efficiency due to trapped light as waveguide modes. This perspective reviews recent works on light extraction, analyzes various extraction structures, and identifies key factors determining extraction efficiencies in tandem OLEDs.
APPLIED PHYSICS LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Stephen Amoah, Xiangyu Fu, Shichen Yin, Qi Dong, Chen Dong, Franky So
Summary: In this study, a top-emitting organic light-emitting diode (OLED) structure with a dielectric spacer and a patterned back mirror is demonstrated to enhance the light outcoupling efficiency. The optimized device shows a significant improvement in external quantum efficiency by efficiently extracting the trapped waveguide modes.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Editorial Material
Chemistry, Physical
Chenchen Yang, Harry A. Atwater, Marc A. Baldo, Derya Baran, Christopher J. Barile, Miles C. Barr, Matthew Bates, Moungi G. Bawendi, Matthew R. Bergren, Babak Borhan, Christoph J. Brabec, Sergio Brovelli, Vladimi Bulovic, Paola Ceroni, Michael G. Debije, Jose-Maria Delgado-Sanchez, Wen-Ji Dong, Phillip M. Duxbury, Rachel C. Evans, Stephen R. Forrest, Daniel R. Gamelin, Noel C. Giebink, Xiao Gong, Gianmarco Griffini, Fei Guo, Christopher K. Herrera, Anita W. Y. Ho-Baillie, Russell J. Holmes, Sung-Kyu Hong, Thomas Kirchartz, Benjamin G. Levine, Hongbo Li, Yilin Li, Dianyi Liu, Maria A. Loi, Christine K. Luscombe, Nikolay S. Makarov, Fahad Mateen, Raffaello Mazzaro, Hunter McDaniel, Michael D. McGehee, Francesco Meinardi, Amador Menendez-Velazquez, Jie Min, David B. Mitzi, Mehdi Moemeni, Jun Hyuk Moon, Andrew Nattestad, Mohammad K. Nazeeruddin, Ana F. Nogueira, Ulrich W. Paetzold, David L. Patrick, Andrea Pucci, Barry P. Rand, Elsa Reichmanis, Bryce S. Richards, Jean Roncali, Federico Rosei, Timothy W. Schmidt, Franky So, Chang-Ching Tu, Aria Vahdani, Wilfried G. J. H. M. van Sark, Rafael Verduzco, Alberto Vomiero, Wallace W. H. Wong, Kaifeng Wu, Hin-Lap Yip, Xiaowei Zhang, Haiguang Zhao, Richard R. Lunt
Summary: The lack of consensus on reporting standards in LSC-PV research hinders fair performance comparison among reports. Standardized characterization protocols are necessary for emerging PV devices to harmonize with other PV devices. The commentary highlights common limitations in LSC literature and suggests best practices for moving forward to achieve meaningful advances in LSC-PV research.
Article
Optics
Melike Biliroglu, Gamze Findik, Juliana Mendes, Dovletgeldi Seyitliyev, Lei Lei, Qi Dong, Yash Mehta, Vasily V. Temnov, Franky So, Kenan Gundogdu
Summary: Researchers have observed room-temperature superfluorescence in hybrid perovskite thin films, indicating a strong immunity to electronic dephasing in these materials. The formation of large polarons is believed to provide quantum isolation to electronic excitation and protect it from dephasing even at room temperature.
Article
Chemistry, Physical
Shichen Yin, Carr Hoi Yi Ho, Shuo Ding, Xiangyu Fu, Liping Zhu, Julian Gullett, Chen Dong, Franky So
Summary: A new strategy for efficient phase-transfer ligand exchange in large-sized quantum dots is reported. This strategy allows for the epitaxial growth of perovskite intermediate on the densely packed organic ligands and charge-neutral facets, resulting in improved film quality and enhanced photodiode performance.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Austin L. Jones, Carr Hoi Yi Ho, Sebastian A. Schneider, Junxiang Zhang, Yusen Pei, Jiayu Wang, Xiaowei Zhan, Seth R. Marder, Michael F. Toney, Franky So, G. N. Manjunatha Reddy, John R. Reynolds
Summary: This study investigates the modulation of organic solar cell efficiencies by adjusting the ionization energy level offset of polymer donors. The results show that different adjustments have different effects on the performance of solar cells. In addition, the structures of the polymers and their blends were characterized using various methods, and their roles in the performance of the cells were analyzed.
CHEMISTRY OF MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Carr Hoi Yi Ho, Yusen Pei, Yunpeng Qin, Chujun Zhang, Zhengxing Peng, Indunil Angunawela, Austin L. Jones, Hang Yin, Hamna F. Iqbal, John R. Reynolds, Kenan Gundogdu, Harald Ade, Shu Kong So, Franky So
Summary: The mobility field-dependent coefficient is found to be a key parameter determining fill factor (FF) loss in thick-film organic solar cells (OSCs). PTQ10 blend film exhibits better performance and can maintain a FF of 74% at a thickness of 300 nm.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Qi Dong, Xiangyu Fu, Dovletgeldi Seyitliyev, Kasra Darabi, Juliana Mendes, Lei Lei, Yi-An Chen, Chih-Hao Chang, Aram Amassian, Kenan Gundogdu, Franky So
Summary: Perovskite distributed feedback (DFB) lasers are attracting attention due to their solution processability, band gap tunability, single-mode operation, and low threshold. This study presents a facile approach to fabricate and design the cavities of perovskite surface-emitting DFB lasers. By adding polyvinylpyrrolidone into the perovskite precursor solutions, the cavity fabrication is simplified, and the effective index of the waveguide mode can be manipulated by varying the solution concentration. The fabricated perovskite DBF lasers achieved an optimized optical resonance and low threshold.
Review
Chemistry, Multidisciplinary
Jiyoung Moon, Yash Mehta, Kenan Gundogdu, Franky So, Qing Gu
Summary: Hybrid metal-halide perovskites (MHPs) have great potential as gain media for on-chip lasers, but the stability and patterning methods of MHP lasers still need improvement. This review aims to provide strategies for improving the properties of MHPs and establishing optimal cavity patterning methods, as well as understanding the emission mechanisms in MHP materials and cavities.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Qi Dong, Liping Zhu, Shichen Yin, Lei Lei, Kenan Gundogdu, Franky So
Summary: In this study, we demonstrate a linearly polarized organic LED with high current efficiency and large polarization ratio by utilizing the intrinsic polarization nature and transverse electric waveguide mode of thin-film LEDs. The device architecture can easily be adopted for other photonic applications, and the current efficiency can be further increased.
Article
Chemistry, Applied
Navidha Aggarwal, Sandeep Jain, Neetu Chopra
Summary: A new series of thiazolidin-4-one analogs with thiadiazole derivative was synthesized using propanoic acid and thiosemicarbazide. The structures of the synthesized compounds were validated using spectral techniques. The in vitro acetylcholinesterase inhibitory activity of these compounds was assessed, and certain compounds showed potent activity, which could be utilized for the development of new AChE inhibitors and further research.
BIOINTERFACE RESEARCH IN APPLIED CHEMISTRY
(2022)
Article
Chemistry, Physical
C. H. Y. Ho, J. Kothari, X. Fu, F. So
Summary: The tandem structure provides a practical way to achieve high-efficiency organic solar cells by overcoming several bottlenecks in single-junction OSCs. The interconnecting layer plays a critical role in determining device performance and reproducibility in tandem OSCs. Different classes of interconnecting layers are compared based on their optical, mechanical, and chemical properties in this review paper.
MATERIALS TODAY ENERGY
(2021)
